The Evolution of a Convergent Orogen from Upper to Lower Crustal Levels

从上地壳层到下地壳层的汇聚造山带的演化

• 批准号: 0087323
• 负责人: Keith Klepeis
• 金额: $ 15.65万
• 依托单位: University of Vermont & State Agricultural College
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2001
• 资助国家: 美国
• 起止时间: 2001-01-01 至 2003-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0087323&HistoricalAwards=false
• 关键词: Evolution; Convergent; Orogen; Upper; Lower

Klepeis0087323Studies of convergent margins worldwide have shown that deformation patterns within continental crust vary according to crustal level and tectonic settings. This project is aimed at determining how strain was partitioned vertically from upper to lower levels of an ancient orogen where the relative strengths and rheology of the middle and lower crust changed during convergence, and will utilize a deeply eroded, early Cretaceous granulite belt in Fiordland, New Zealand. Results should provide a measure of the characteristics and kinematics of ancient lower crustal strain fields and determine how they changed vertically through the crust, thereby addressing the extent to which the upper, middle and lower crust were coupled, and the effects of a changing strength profile as orogenesis proceeded. Successful results are expected to be applicable to a wide range of tectonic

Klepeis0087323对全球汇聚边缘的研究表明，大陆地壳内的变形模式根据地壳水平和构造环境的不同而变化。 该项目旨在确定古代造山带的应变是如何从上层到下层垂直分配的，其中中地壳和下地壳的相对强度和流变性在汇聚过程中发生变化，并将利用新西兰峡湾地区深受侵蚀的早白垩世麻粒岩带。 结果应提供对古代下地壳应变场的特征和运动学的测量，并确定它们如何在地壳中垂直变化，从而解决上、中、下地壳耦合的程度，以及造山作用过程中强度剖面变化的影响。 成功的结果预计将适用于广泛的构造